ATtiny microcontroller comparison chart

ATtiny (also known as TinyAVR) is a subfamily of the popular 8-bit AVR microcontrollers, which typically has fewer features, fewer I/O pins, and less memory than other AVR series chips. The first members of this family were released in 1999 by Atmel (later acquired by Microchip Technology in 2016).^[1]

ATtiny2313 in 20-pin narrow dual in-line package (DIP-20N)

Features

ATtiny microcontrollers specifically exclude various common features, such as: USB peripheral, DMA controller, crypto engine, or an external memory bus.

The following table summarizes common features of the ATtiny microcontrollers, for easy comparison. This table is not meant to be an unabridged feature list.

Device (family)[2]	Max clock (MHz)	Flash (KiB)	SRAM (bytes)	EEPROM (bytes)	USART (UART)	I²C (TWI)	SPI	Timers 16/12/8 (bits)	ADC pins	GPIO pins	IC Packages	GCC arch ID [3]	Pgm Dbg	Refs
ATtiny11, ATtiny11L	6, 2	1	No	No	No	No	No	0 / 0 / 1	No	5	DIP-8N, SO200-8	avr1	HVSP	[4]
ATtiny12, ATtiny12L, ATtiny12V	8, 1.2	1	No	64	No	No	No	0 / 0 / 1	No	5	DIP-8N, SO200-8	avr1	ISP, HVSP	[4]
ATtiny15L	1.6	1	No	64	No	No	No	0 / 0 / 2	4	6	DIP-8N, SO200-8	avr1	ISP, HVSP	[5]
ATtiny28L, ATtiny28V	4, 1.2	2	No	No	No	No	No	0 / 0 / 1	No	11	DIP-28N, TQFP-32, QFN-32	avr1	HVPP	[6]
ATtiny22, ATtiny22L	8, 4	2	128	128	No	No	No	0 / 0 / 1	No	5	DIP-8N, SO200-8	avr2	ISP, HVSP	[7]
ATtiny26, ATtiny26L	16, 8	2	128	128	USI*	master, slave*	master, slave*	0 / 0 / 2	11	16	DIP-20N, SO300-20, QFN-32	avr2	ISP, HVPP	[8]
ATtiny13, ATtiny13V, ATtiny13A	20, 10	1	64	64	No	No	No	0 / 0 / 1	4	6	DIP-8N, SO150-8, SO209-8, VQFN-10, WQFN-20	avr25	ISP, dW, HVSP	[9][10][11]
ATtiny24, ATtiny24V, ATtiny24A, ATtiny44, ATtiny44V, ATtiny44A, ATtiny84, ATtiny84V, ATtiny84A	20, 10	2, 4, 8	128, 256, 512	128, 256, 512	USI*	master, slave*	master, slave*	1 / 0 / 1	8	12	DIP-14N, SO150-14, QFN-20, VQFN-20, UFBGA-15	avr25	ISP, dW, HVSP	[12][13][14][15][16][17]
ATtiny25, ATtiny25V, ATtiny45, ATtiny45V, ATtiny85, ATtiny85V	20, 10	2, 4, 8	128, 256, 512	128, 256, 512	USI*	master, slave*	master, slave*	0 / 0 / 2[a]	4	6	DIP-8N, SO208-8, TSSOP-8, QFN-20	avr25	ISP, dW, HVSP	[18][19][20]
ATtiny43U[b]	8	4	256	64	USI*	master, slave*	master, slave*	0 / 0 / 2	4	16	SO300-20, QFN-20	avr25	ISP, dW, HVPP	[21]
ATtiny48, ATtiny88	12	4, 8	256, 512	64	No	master, slave	master, slave	1 / 0 / 1	6	24	DIP-28N, QFN-28	avr25	ISP, dW, HVPP	[22][23]
					No	master, slave	master, slave	1 / 0 / 1	8	28	TQFP-32, QFN-32, UFBGA-32
ATtiny87, ATtiny167	16	8, 16	512	512	USI*, UART*	No	master, slave	1 / 0 / 1	11	16	SO300-20, TSSOP-20, VQFN-32	avr25, avr35	ISP, dW, HVPP	[24][25]
ATtiny261, ATtiny261A, ATtiny461, ATtiny461A, ATtiny861, ATtiny861A	20	2, 4, 8	128, 256, 512	128, 256, 512	USI*	master, slave*	master, slave*	1 / 0 / 1[c]	11	16	DIP-20N, SO300-20, TSSOP-20, QFN-32	avr25	ISP, dW, HVPP	[26][27][28][29][30]
ATtiny441, ATtiny841	16	4, 8	256, 512	256, 512	2 USART*	slave	master, slave	2 / 0 / 1	12	12	SO150-14, QFN-20, VQFN-20	avr25	ISP, dW, HVSP	[31][32]
ATtiny828	20	8	512	256	USART*	slave	master, slave	1 / 0 / 1	28	28	TQFP-32, QFN-32	avr25	ISP, dW, HVPP	[33]
ATtiny1634	12	16	1024	256	USI*, 2 USART*	slave	master*	1 / 0 / 1	12	18	SO300-20, QFN-20	avr35	ISP, dW, HVPP	[34]
ATtiny2313, ATtiny2313V, ATtiny2313A, ATtiny4313	20	2, 4	128, 256	128, 256	USI*, USART*	master, slave*	master, slave*	1 / 0 / 1	No	18	DIP-20N, SO300-20, VQFN-20	avr25	ISP, dW, HVPP	[35][36][37][38]
ATtiny4, ATtiny5, ATtiny9, ATtiny10	12	0.5 / 1	32	No	No	No	No	1 / 0 / 0	4 [d]	4	SOT23-6, UDFN-8	avrtiny	TPI	[39][40][41][42]
ATtiny20	12	2	128	No	No	slave	master, slave	1 / 0 / 1	8	12	SO150-14, TSSOP-14, VQFN-20, UFBGA-15, WLCSP-12	avrtiny	TPI	[43]
ATtiny40	12	4	256	No	No	slave	master, slave	1 / 0 / 1	12	18	SO300-20, TSSOP-20, VQFN-20	avrtiny	TPI	[44]
ATtiny102(F)	12	1	32	No	USART*	No	master*	1 / 0 / 0	5	6	SO150-8, UDFN-8	avrtiny	TPI	[45]
ATtiny104(F)	12	1	32	No	USART*	No	master*	1 / 0 / 0	9	12	SO150-14	avrtiny	TPI	[46]
ATtiny202, ATtiny402 (0-series)	20	2, 4	128, 256	64, 128	USART*	master, slave	master, slave	2 / 0 / 0 / RTT	6	6	SO150-8	avrxmega3	UPDI	[47][48]
ATtiny204, ATtiny404, ATtiny804, ATtiny1604 (0-series)	20	2, 4, 8, 16	128, 256, 512, 1024	64, 128, 256	USART*	master, slave	master, slave	2 / 0 / 0 / RTT	10	12	SO150-14	avrxmega3	UPDI	[49][50][51][52]
ATtiny406, ATtiny806, ATtiny1606 (0-series)	20	4, 8, 16	256, 512, 1024	128, 256	USART*	master, slave	master, slave	2 / 0 / 0 / RTT	12	18	SO300-20, VQFN-20	avrxmega3	UPDI	[53][54][55]
ATtiny807, ATtiny1607 (0-series)	20	8, 16	512, 1024	128, 256	USART*	master, slave	master, slave	2 / 0 / 0 / RTT	12	22	VQFN-24	avrxmega3	UPDI	[56][57]
ATtiny212, ATtiny412 (1-series)	20	2, 4	128, 256	64, 128	USART*	master, slave	master, slave	2 / 1 / 0 / RTT	6	6	SO150-8	avrxmega3	UPDI	[58][59]
ATtiny214, ATtiny414, ATtiny814, ATtiny1614 (1-series)	20	2, 4, 8, 16	128, 256, 512, 2048	64, 128, 256	USART*	master, slave	master, slave	2 / 1 / 0 / RTT	10	12	SO150-14	avrxmega3	UPDI	[60][61][62][63]
ATtiny416, ATtiny816, ATtiny1616, ATtiny3216 (1-series)	20	4, 8, 16, 32	256, 512, 2048	128, 256	USART*	master, slave	master, slave	2or3 / 1 / 0 / RTT	12	18	SO300-20, QFN-20, VQFN-20	avrxmega3	UPDI	[64][65][66][67]
ATtiny417, ATtiny817, ATtiny1617, ATtiny3217 (1-series)	20	4, 8, 16, 32	256, 512, 2048	128, 256	USART*	master, slave	master, slave	2 / 1 / 0 / RTT	12	22	VQFN-24, QFN-24	avrxmega3	UPDI	[68][69][70][71]
ATtiny424, ATtiny824, ATtiny1624, ATtiny3224 (2-series)	20	4, 8, 16, 32	512, 1024, 2048, 3072	128, 128, 256, 256	2 USART*	yes	yes	3 / 0 / 0 / RTT	9	12	SO-14, TSSOP-14	avrxmega3	UPDI	[72][73]
ATtiny426, ATtiny826, ATtiny1626, ATtiny3226 (2-series)	20	4, 8, 16, 32	512, 1024, 2048, 3072	128, 128, 256, 256	2 USART*	yes	yes	3 / 0 / 0 / RTT	15	18	SO-20, SSTOP-20, VQFN-20	avrxmega3	UPDI	[74][75]
ATtiny427, ATtiny827, ATtiny1627, ATtiny3227 (2-series)	20	4, 8, 16, 32	512, 1024, 2048, 3072	128, 128, 256, 256	2 USART*	yes	yes	3 / 0 / 0 / RTT	15	22	VQFN-24	avrxmega3	UPDI	[76][77]
Device (family)	Max clock (MHz)	Flash (KiB)	SRAM (bytes)	EEPROM (bytes)	USART (UART)	I²C (TWI)	SPI	Timers 16/12/8/R (bits)	ADC pins	GPIO pins	IC Packages	GCC arch ID	Pgm Dbg	Refs

Notes

1. timer0 can use clocks up to the core clock, timer1 can use clocks up to 64MHz
2. Ultra-low voltage model with integrated boost converter that can be powered with only 0.7 volts.
3. timer/counter1 is a 10-bit counter that can use clocks to 64MHz.
4. ADC only on ATtiny5/10, and channels are 8 bits instead of 10

• Package column - the number after the dash is the number of pins on the package. DIP packages in this table are 0.3 inches (7.62 mm) row-to-row. SOwww means SOIC package with a case width of 'www' in thousandth of an inch. Though some package types are known by more than one name, a common name was chosen to make it easier to compare packages.
• UART/I²C/SPI columns - green cell means a dedicated peripheral, * yellow cell means a multi-feature peripheral that is chosen by setting configuration bits. Most USART peripherals support a minimum choice between UART or SPI, where as some might support additional choices, such as LIN, IrDA, RS-485.
• Timers column - more recent families have wider timers and may allow chaining two 16-bit timers to do 32-bit capture. RTT is a 16-bit Real Time Timer that is driven by a 32.768KHz clock, though Microchip calls it RTC for Real Time Counter (easily confused to mean Real Time Clock).
• ADC pins column - the total number of analog channels that are accessible via pins that multiplex into the ADC input. Most parts have one ADC, a few have two ADC.
• Pgm/Dbg column - flash programming and debugging protocols: HVPP means High Voltage Parallel Programming 12V protocol, HVSP means High Voltage Serial Programming 12V protocol, ISP means In-System Programmable protocol, uses SPI to program the internal flash. TPI is Tiny Programming Interface. dW means debugWIRE protocol. UPDI means Unified Program and Debug Interface protocol (newest).^[78]

Abbreviations

• TWI: Many of Atmels microcontrollers contain built-in support for interfacing to a two-wire bus, called Two-Wire Interface. This is essentially the same thing as the I²C interface by Philips, but that term is avoided in Atmel's documentation due to trademark issues.
• USI: Universal Serial Interface (not to be confused with USB). The USI is a multi-purpose hardware communication module. With appropriate software support, it can be used to implement an SPI,^[79] I²C^[80][81] or UART^[82] interface. USART peripherals have more features than USI peripherals.

Timeline

Newer parts use this naming convention

The following table lists each ATtiny microcontroller by the first release date of each datasheet.

Year	Device (family)
1999	ATtiny11, ATtiny11L, ATtiny12, ATtiny12L, ATtiny12V, ATtiny22, ATtiny22L
2002	ATtiny15L, ATtiny26, ATtiny26L, ATtiny28L, ATtiny28V
2003	ATtiny13, ATtiny13V, ATtiny2313, ATtiny2313V, ATtiny4313
2005	ATtiny24, ATtiny24V, ATtiny25, ATtiny25V, ATtiny44, ATtiny44V, ATtiny45, ATtiny45V, ATtiny84, ATtiny84V, ATtiny85, ATtiny85V
2006	ATtiny261, ATtiny461, ATtiny861
2008	ATtiny13A, ATtiny24A, ATtiny44A, ATtiny48, ATtiny84A, ATtiny88
2009	ATtiny4, ATtiny5, ATtiny9, ATtiny10, ATtiny43U, ATtiny261A, ATtiny461A, ATtiny861A, ATtiny2313A
2010	ATtiny20, ATtiny40, ATtiny87, ATtiny167
2011	ATtiny1634
2012	ATtiny441, ATtiny841, ATtiny828
2016	ATtiny102(F), ATtiny104(F), ATtiny417, ATtiny817
2017	ATtiny212, ATtiny412, ATtiny214, ATtiny414, ATtiny814, ATtiny416, ATtiny816
2018	ATtiny202, ATtiny402, ATtiny204, ATtiny404, ATtiny804, ATtiny1604, ATtiny406, ATtiny806, ATtiny1606, ATtiny807, ATtiny1607, ATtiny1614, ATtiny1616, ATtiny3216, ATtiny1617, ATtiny3217
2020	ATtiny1624, ATtiny1626, ATtiny1627
2021	ATtiny424, ATtiny824, ATtiny426, ATtiny826, ATtiny427, ATtiny827

Development boards

The following are ATtiny development boards sold by Microchip Technology:

• ATtiny104 Xplained Nano^[83]
• ATtiny416 Xplained Nano^[84]
• ATtiny817 AVR Parrot^[85]
• ATtiny817 Xplained Mini^[86]
• ATtiny817 Xplained Pro^[87]
• ATtiny3217 Xplained Pro^[88]

See also

• Electronics portal

• AVR microcontrollers
• Atmel AVR instruction set
• In-system programming
• Arduino